Implement unicode on console, move readline into driver

luprex/cpp/drv/driver.cpp

@@ -54,6 +54,7 @@ class Driver {
         CHAN_SSL_ACCEPTING,
         CHAN_SSL_READWRITE,
     };
+
     struct ChanInfo {
         int chid;
         SOCKET socket;
@@ -89,6 +90,7 @@ class Driver {
     bool read_console_recently_;
     std::unique_ptr<struct pollfd[]> pollvec_;
     std::unique_ptr<char[]> chbuf_;
+    ReadlineDevice readline_device_;
 
     sslutil::UniqueCTX ssl_server_ctx_;
     sslutil::UniqueCTX ssl_client_secure_ctx_;
@@ -202,20 +204,27 @@ class Driver {
             engw.get_outgoing(&engw, 0, &ndata, &data);
             if (ndata == 0) break;
             if (ndata > DRV_SHORTSTRING_SIZE) ndata = DRV_SHORTSTRING_SIZE;
-            int nwrote = console_write(data, ndata);
-            if (nwrote <= 0) break;
-            engw.play_sent_outgoing(&engw, 0, nwrote);
+            std::string_view src(data, ndata);
+            int consumed;
+            CodepointString cps = ReadlineDevice::from_utf8(src, &consumed);
+            readline_device_.print(cps);
+            engw.play_sent_outgoing(&engw, 0, consumed);
         }
     }
 
     void handle_console_input() {
-        char buffer[256];
         read_console_recently_ = false;
         while (true) {
-            int nread = console_read(buffer, 256);
-            if (nread <= 0) break;
+            CodepointString cps = console_read();
+            if (cps.size() == 0) break;
             read_console_recently_ = true;
-            engw.play_recv_incoming(&engw, 0, nread, buffer);
+            for (char32_t c : cps) {
+                CodepointString line = readline_device_.putcode(c);
+                if (!line.empty()) {
+                    std::string utf8 = ReadlineDevice::to_utf8(line);
+                    engw.play_recv_incoming(&engw, 0, utf8.size(), utf8.c_str());
+                }
+            }
         }
     }
 
@@ -575,6 +584,9 @@ class Driver {
     }
 
     int drive(int argc, char *argv[]) {
+        // Set up the console readline device.
+        readline_device_.set_print_callback(console_write);
+
         // Remove the program name from argv.
         std::string program = argv[0];
         argc -= 1;